beancount_replace_transaction
AI agents use beancount_replace_transaction to create or update resources in Beancount — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Beancount environment.
The tool name suggests it replaces an existing transaction, which is a write/modify operation on financial ledger data. Since it modifies financial records (ledger transactions), it carries high severity — replacing a transaction could alter financial history. However, because the description is empty, confidence is moderate.
From the tool's definition Tool name 'beancount_replace_transaction' implies replacing/overwriting an existing transaction in the ledger. Description is empty, so full behavior is unknown.
Documented attack patterns abuse exactly the kind of access beancount_replace_transaction gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Beancount, and nothing reaches the server without passing your rules. This is the rule we recommend for beancount_replace_transaction:
{
"version": "1",
"default": "deny",
"tools": {
"beancount_replace_transaction": {
"limits": [
{
"counter": "beancount_replace_transaction_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}beancount_replace_transaction stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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beancount_replace_transaction. It is categorised as a Write tool in the Beancount MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Beancount MCP server in PolicyLayer and add a rule for beancount_replace_transaction: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Beancount. Nothing to install.
beancount_replace_transaction is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the beancount_replace_transaction rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for beancount_replace_transaction. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
beancount_replace_transaction is provided by the Beancount MCP server (stdioa/beancount-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Beancount, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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6 Beancount tools catalogued and risk-classified — across an index of 43,000+ MCP servers.